POTENTIAL TRANSFORMER....

Potential transformer is almost same as power transformer. But used for only step down of  high voltages to 110 V (line to line).It was very low power rating which is used for only burden. As our voltmeters and energy meters and relays are unable to work with very high voltages, we step down the voltage range and use that for meters and relays and multiply with factor.
     generally secondary voltage is 110 V (line-line) where as primary voltage is of order of kilo volts.

DIFFERENT TESTS OF POTENTIAL TRANSFORMER:

1. INSULATION RESISTANCE TEST...

2. POLARITY...

3.RATIO ...

4.WINDING RESISTANCE ...